Swivel bearing with axial groove ball bearing

Abstract

Rotary bearings, in particular for vehicle seats, with two bearing discs (10, 14) which are rotatable relative to each other about an axis of rotation (A) and are supported against each other by an axial groove ball bearing (16) which has two bearing rings (20, 22) which each form two annular grooves (26, 32) for receiving bearing balls (34), wherein the bearing rings (20, 22) form two C-profiles, the parallel legs (24, 30) of which are oriented perpendicular to the axis of rotation (A) and which interlock such that one C-profile surrounds the other, and the grooves (26, 32) are formed in the paired legs (24, 30) of these C-profiles which run parallel to each other, characterized in that the bearing rings (20, 22) are profile rails bent into circular rings.

Description

[0001] The invention relates to a rotary bearing, in particular for vehicle seats, with two bearing discs that are rotatable relative to each other about an axis of rotation and are supported against each other by an axial groove ball bearing, which has two bearing rings that each form two annular grooves for receiving bearing balls.

[0002] Such swivel bearings are used in particular for the rotatable mounting of seats in autonomous vehicles, thus enabling the vehicle occupants to change the orientation of their seat.

[0003] From EP 2 907 691 A1, a rotary bearing of this type is known in which the two grooves of each bearing ring are arranged concentrically to each other and differ in diameter. To ensure cohesion of the bearing rings, one of the bearing rings is formed in two parts, and a part forming one of the two grooves overlaps a part of the other bearing ring in which a corresponding groove is formed.

[0004] The object of the invention is to create a rotary bearing that has a simple and compact design and in which the bearing rings are held together stably.

[0005] This problem is solved according to the invention by the bearing rings forming two C-profiles whose parallel legs are oriented perpendicular to the axis of rotation and which interlock in such a way that one C-profile surrounds the other, and by forming the grooves in the paired legs of these C-profiles which run parallel to each other.

[0006] The profile configuration of the bearing rings thus corresponds to the profile configuration that is common for drawer slides in furniture, except that the slides there run in a straight line, whereas in the rotary bearing according to the invention they are closed into circular rings. The raceways for the bearing balls are each formed by two opposing and mutually open grooves in the two bearing rings. By engaging these grooves, the bearing balls hold the two bearing rings stably in position in both the axial and radial directions. The raceways for the bearing balls are spaced axially apart from each other and can have the same diameter. This means that the rotary bearing requires very little installation space, especially in the radial direction.

[0007] The manufacturing process for the rotary bearing can proceed as follows: first, two straight profile rails are produced, fitted with the bearing balls, and axially inserted into one another. Then, they are bent together to form circular rings. Alternatively, the profile rails can initially be in the form of circular segments, which are engaged in pairs, after which the pairs are joined to form a closed ring. In yet another embodiment, the profile rails initially have the form of spirals, each forming a complete turn, which are then "screwed" together and finally closed to form a ring.

[0008] Advantageous embodiments of the invention are specified in the dependent claims.

[0009] The following section explains an exemplary embodiment in more detail with reference to the drawing.

[0010] They show: Fig. 1 a section through a rotary bearing according to the invention; and Fig. 2 a detailed enlargement to Fig. 1.

[0011] The in Fig. The rotary bearing shown has a cup-shaped bearing disc. 10 with a cylindrical outer rim 12 and a flat, ring-shaped bearing disc 14 on, which the edge 12 the bearing disc 10 surrounds at a distance. In the annular gap between the bearing discs 10 and 14 is an axial groove ball bearing 16 arranged by which the bearing discs 10 , 14 They are connected to each other in such a way that they can rotate relative to each other about an axis of rotation A.

[0012] An enlarged radial section through the axial groove ball bearing 16 is in Fig. 2 shown. This bearing has an outer bearing ring. 18 and an inner bearing ring 20 on, both of which have a C-shaped profile.

[0013] The outer bearing ring 18 has a base 22 , which is oriented parallel to the axis of rotation A and is located on the inner circumferential edge of the annular bearing disc 14 is attached. From the base 22 parallel legs 24 from which are oriented perpendicular to the axis of rotation A and are each profiled in such a way that they have two opposing grooves that are concave on the sides facing each other. 26 form.

[0014] The inner bearing ring 20 has a base 28 , which is also oriented parallel to the axis of rotation A and from which parallel legs 30 exiting, which are oriented perpendicular to the axis of rotation A and are profiled in such a way that they have two grooves on the sides facing away from each other 32 form. The C-profile of the inner bearing ring 20 is from the thighs 24 of the outer bearing ring 18 encompassed, so that the grooves 26and 32 opposite each other and raceways for bearing balls 34 form, which are in a common spherical cage 36 are held.

[0015] In the example shown, the grooves 26 and 32 arranged so that the two raceways for the bearing balls 34 have the same diameter. Through the grooves 26 , 32 engaging bearing balls 34 will the bearing rings 18 and 20 held together in such a form-fitting manner that they cannot shift relative to each other in either the axial or radial direction.

[0016] During manufacturing, the bearing rings 18 and 20 initially manufactured as straight profile rails, which are fitted with bearing balls 34The profile rails are loaded and axially slid into one another. Then, the profile rails are bent together into circular rings. The ends of the rails, which then butt against each other, can optionally be welded together or remain unconnected. The complete axial groove ball bearing 16 will then be used with the base 22 of the outer bearing ring 18 into the opening of the bearing disc 14 inserted, and into the inner bearing ring 20 The cup-shaped bearing disc 10 used, whose circumferential edge 12 in some suitable way at the base 28 of the bearing ring 20 is attached.

[0017] In the base of the pot-shaped bearing ring 10 are mounting holes 38 designed to allow the swivel bearing to be mounted, for example, on the underbody of a motor vehicle. The bearing disc 14can be part of a seat frame or connected to it, so that the entire seat frame can be rotated relative to the vehicle floor around the axis of rotation A. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 2907691 A1

[0003]

Claims

[1] Swivel bearing, in particular for vehicle seats, with two bearing discs (10, 14) which are rotatable relative to each other about an axis of rotation (A) and are supported against each other by an axial groove ball bearing (16) which has two bearing rings (20, 22) which each form two annular grooves (26, 32) for receiving bearing balls (34), characterized by , that the bearing rings (20, 22) form two C-profiles whose parallel legs (24, 30) are oriented perpendicular to the axis of rotation (A) and which interlock in such a way that one C-profile surrounds the other, and that the grooves (26, 32) are formed in the pairwise parallel legs (24, 30) of these C-profiles. [2] Rotary bearing according to claim 1, wherein one (10) of the bearing disks (10, 14) has a cylindrical circumferential wall (12) which is connected to the base (28) of the C-profile of one (20) of the bearing rings (18, 20). [3] Rotary bearing according to claim 1 or 2, wherein one (14) of the bearing disks (10, 14) is designed in an annular shape and the base (22) of the C-profile of one (18) of the bearing rings (18, 20) is attached to the inner circumferential edge of this annular bearing disk (14). [4] Rotary bearing according to one of the preceding claims, wherein the raceways defined by the grooves (26, 32) for the bearing balls (34) have the same diameter.

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